Method of using high molecular weight aromatic polyol polyesters as demulsifiers for crude oil treatment

Abstract

A method of demulsifying crude oil, said method comprising the step of reacting an amount of crude oil with a polyester demulsifier, therein the demulsifier is used in quantities from 0.0001% to 5% (1-50,000 ppm), preferably 0.0005% to 2% (5-20,000 ppm), more preferably 0.0008% to 1% (8-10,000 ppm) and most preferably 0.001 to 0.1 wt. % polymer (10-1,000 ppm) related to the oil fraction of the utilized emulsion.

What is claimed is: 
     
       1. A method of demulsifying crude oil, said method comprising the step of:
 reacting an amount of crude oil with a demulsifier, wherein said demulsifier has the chemical formula: 
 
       
         
           
           
               
               
           
         
       
       Wherein R 1  is EO, PO or mixtures thereof; R 2  is PO, EO, or mixtures thereof; m≥1; and n≥0. 
     
     
       2. The method of  claim 1 , wherein said demulsifier is added to the crude oil at a concentration of about 1-50,000 ppm. 
     
     
       3. The method of  claim 1 , wherein said demulsifier is added to the crude oil at a concentration of about 5-20,000 ppm. 
     
     
       4. The method of  claim 2 , wherein said demulsifier is added to the crude oil at a concentration of about 8-10,000 ppm. 
     
     
       5. The method of  claim 3 , wherein said demulsifier is added to the crude oil at a concentration of about 10-1,000 ppm. 
     
     
       6. The method of  claim 1 , wherein the molecular weight of the demulsifier is between about 200 g/mol to about 100,000 g/mol.